Workholding chuck



Feb- 23, 1932. c. 1. PACKER 1,846,898

WORKHOLDING CHUCK Filed'March 1l. 1930 2 Sheets-Sheet l Feb. 23, 1932. c, PACKER WORKHOLDING CHUCK Filed March ll. 1930 2 Sheets-Sheet 2 Patented Feb. 23,` 1932 i ma ,S1-ms- CLIFFORD I. rAcKEnQor MERIDEN, CONNECTICUT', AssIeNon 'ro THE o. I. rAcKER PATENT Aoi-Ficis;

wonxnoLnI-NG CHUCK f" Application mea Maman, 1930; semi ndeaaeoz. f

j This invention relates to an improvement in work-holding chucks and particularly yto work-holding chucks of the type designed for use upon Vautomatic grinding, bufhng and 5 polishing machines, though not so limited; The main object of this invention is to provider a simple, compact and convenient chuck of the type referred to, characterized 'its superior resistance to wear' and derangement. With theV above and other objects 1n View,

' as will appear from the following, m in,-

vention consists in av work-holding lc `uckv having certain details of construction ,and combinations of parts as will be hereinafter 5 described and, particularly recited inV theY claimsf; j

In'the accompanying drawings:

' fFig. 1 is aview in side elevation of'av work' V holding chuck embodying my inventionand 2Q shown as mounted upon the table ofan autoshown in section;y u u wlzlig.v 2 is a top or plan view thereof ;y

matic machine which is broken avvayjandl "Fig. `3 is a transverse sectional vr wy taken 25 on the line 3 3 of Figl but ona'la'rger scale;

` Fig. Liis a vertical, central, sectional view of. my improved chuck taken on the line L4-4 of Fig.2and showing theparts in thefposie 30 tions due to Ythem when the j awsare expanded to ripthework ,e g ig. 5 is a'fcoriespondng view, but show lingythe parts in the positions dueto them when the jaw-control plunger has been movedl 35 topermit the j awsto retire and free'f the work Fig. 6 is a detachedtop or plan 'view of the jaw-carrying head; u Y

` Fig. A8 is afdetached perspectivevievv one ofthe pivotal jaws.

In the particular embodiment of my inven# tion herein chosen for illustration, I employ a2 4B jaw-carrying head 10 formed in its inner face with a cylindrical axial `socket 11 receiving the upperend of a chambered driving-' spindle 12 rotating within a bushing' 13 of bronze orother suitable antifrictionmetal,

9 mounted in a sleeve-like mounting-plate`14 w thereof in side elevation;v

the bushing 13 isy enlarged and cuttofform an 'roer'.-v & DIE COMPANY, or MERIDEN, coNNEoTrGUT, acojaronn'rron i; j

integral.Y driving-pinion .17 for; engagement f by any suitable mechanismdesignedto impart ,a rotaryl movement to the,chuck. upper' end of the driving-spindle 121s cou-` pled to tlleihad' 10 by providing the latter with a, radial-setscrewlS projecting into af upperend of thesaid spindl shallow socketlQ in theperiphery ofthe formed at equidistantpointsin itsfperiphery the opposite walls fthereoffV Eachjawis formed Vwith an outwardly-offsetting lug 23 Shaving a downwardly-facing pilot-boss fitting within thef'upperend of a helical jawr'etractingsprin V25, the lower endof which` receives gap. pilotoss 26 upstandingffroma lug 27 radially-o1setting from the chuck# carrying head ,10, centrally beneath -V each 'of the respective vj aws 21.

VTo limit the inward. swinging movement ofthe ,j aws 21,each` of the same isprovided;

with a radial stop-screwf28, carryingia lock# 65 Thej aw-.carrying` headlO, above referred.. ,l to, is of Vsubstantially vcylindrical -formand is with three A(morefor less)vverticallyarranged cesses 2(7); above referredtmis apivotal jaw. Y 21 mountedupona pin 22 extending across. each ofthe said recessesand supported nut`29jatits outerendand adapted to'gengage.

the innerwallof the particularrecess 20 in which it happens tov be installed, as olearly` shown in Fig.`5 ofthe drawings.. y f

For the. purpose of swingingthe jaws V21 outward as required to grip the work, eachl of the 'same is provided with an irmfardly-` projecting nose 30, the innerV face ofwhichis;

conically contoured and bears against the pe-V vriphe'ry ofV 'a conical jaw-expanding lcam l threaded upon the tippen end offa jawcone trol "plunger 32 and'loc'ked ,in variousfpos'il;

tions ofl adjustment thereupon'by means of` aA lrsa 3Q Y Y i er 32. with respect to ,the .spindle-12,' also Y lo seat 36 threaded upon the lower end of the said plunger and adaptedV tojbe locked in place thereon in anyone of a variety'of' posi'- tions of adjustmentby means of aj'am-nut seat 36 is the lower endl of a helicaljaw-ex-Y panding spring 38 encircling the plunger .32 and housed within a longitudinal chamber 39 formed in the driving-spindle-12 and in tersectedat its upperend by the passage 3 5 in which the said plunger reciprocates. The

` upper end of the spring 38 impinges against chamber 39` aforesaid.

a shoulderl 40 formed 'm the driving-spindle 12 at the junction `of the passagei3'5 and The'spring 38 exerts a" constant elijort to depressv the plunger-32, forthe purpose as will vhereinafter appear, and the'V resulting downward movement lof the plunger islim'- "ited byV providing it with adiarnetricallyarranged stop-pin 41 riding in. a V'diametri-c .groove 42f in ,the upper end oflthe drivingspindle-12. vThe said pin, in addition to limitingthe downward movementof the plungvserves to couple thesaid'parts 'together for V'concurrent rotation.

*The-under face of there@ 1o is'ierme'a with an annular recess 43 forthe reception of a dust-Guard 44.' secured to the driving-spindfle 12 liymeansgofa set-'screw 145fand provided in turn'infitsunder'face with an annular recessy 46, resulti'ngin the lfoi`f1nati`on ofY an posed between the .under face 4thereofand the upperV facezo' the adjacent ends ofthe bushing13 and the mounting-plate 14, isa hardened thrust-washer 48"` through which the driving-spindle -12 extends, as-clearlvY shown in Figs. 4 andl 5 of. the drawings'. j For the purpose of adapting the jaws. 21to griplvarious articles-which aretobe operated, upon, I provide .each ofthe, said jawsy with interchangeable jaw-extensions 494 attached thereto byv screws 50 and having their outer facesv shaped: to conform to the particular pieceofw'ork Vbeing handled, such for. inr stance asa cup-shaped., yclock-case 51,.shown in Figs; i amr 5:

" SerialV In the .use of my improved' chuck, it preferably' mounted in an automatic machine,

'suchfor instance` as that shown infiny copend'ino application, led January 16,A 1930, ENo.v 421,148, and adaptedto be rotated as itis bodily moved by means of the work-tablefl', in connection withwhich'a' earn isremployed,'asfindicated by the broken lines 52in Figs. 4 and 5. 1 y e f Normally, the jaw-expanding spring 38l y -plunger 32l rides up the rise 54 of the cam 52',

thertension lof the springv` 38 will be overcome and the said plunger lifted to permit the jaw-.retracting spring 25 of each of the jaws to swing the latter inward, together with their supplementary 4jaws 49, into the positions shown in Fig. 5, thereby releasing the work for Vremoval and permitting lthe, application'ofanother piece to be'perated upon, it Vbeing understood that all 4of, the chuck parts, with the exceptionvofthe mounting;- plate' 14 and the bushing 13, are Vadaptedfto be rapidly'rotated by any `suitable' means engagingthe pinion 17'v at'the lower' end of. the driving-spindle12';v Y f Should it be desired to alter the throw ofI the jaws 21, itwill be seen fromthe 'drawings that this'may be vreadily 'accomplished by loosening the jam-nut 33 and threadingthe jconi'callcarn" 31 in orout upon the plung; er32, asrequired.k When handling rela-i tively thinl and flexible metal parts, it` is highly important that the outward tension upon the jawsff 21 be carefullyregulated, and

this maybe accomplished by suitably adjust-A ving the spring-seat 36l upon the 1 lower end] .of the plunger 321:0 vary the vtension of the.

helical jaw-expanding springs 38. i j

It will; thusbe seen that Illiave provided an extremely'rugged chuck adapted for'use infautomatic machinesjand organized so as' to be` subjectedr to the minimum ofwear and' r'equiring but slight effort for its adjustment.

' `fIclalm:

1. In a work-holding ythe combinar tion with a j aw-carrying headga plurality of work-gripping jaws mounted in thesaid-head l with capacity fory radial movement'with'lrespec't thereto; a mounting-member forthe sa'ijdfhead; a longitudinally-chambered driving-spindle projecting Vfrom saidhead and' rotatably mounted in the said mounting-member; `a reciprocating jaw-expandingl plunger extending axially through :the vsaid-head and driving-spindle a helicalspring' encircling' the lsaid-plunger within the chamber-of the said driving-spindle and exerting adirect and constant effort tomove the sameintogits jawexpanding .position-l; .andl spring means normally urging the said ,work-'gripping jaws` intoftheir inwardly-'retracting positions.

Y 2L A work-carrying chuckas deiined in claim 1 Yand having a. spring-seat. adjustably mounted upon the retracting-plunger to varyv the tension of thejaw-expandingspring. V- work-carryingk chuck as dene'd.'

l membe annular chamber to receive a portion of th mounting-member. f

4. In a work-holding chuck, the combination with a jaw-.carrying head -a pluralityof work-gripping jaws Vmounted in said head with capacity for radial movement with respect thereto; a mounting-member orthe said head; a driving-spindle extending from said head and rotatably mounted. in said mounting-member; means for moving the said jaws cinto their expanded positions; spring means normally urging the said workgripping jaws into their retracted positions; and an adjustable stop carried by each of the said jaws and engageable with a part of the chuck structure to limit the movement of the said jaws into their retracted positions;

may be individually regulated to accommodate various forms of work.

Y 5. In a work-holding chuck the combination with a jaw-carrying head; a plurality of workegripping aws mounted in the Vsaid; head with capacity for radial movement with respect thereto; a. mounting-member for the said head; a longitudinally-chambered driving-spindle projecting fromsaid head and rotatably mounted in the said mountingr; a reciprocating aw-expanding plunger extending axially through the said hea-d and driving-spindle; a helical spring encircling the said plunger within thechamber of the said driving-spindle andexerting a constant effort to move the same into its jaw-expanding position; and an adjustable'V stop carried by each of the said jaws and engageable with a part of the chuck structure to limit the movement of the said jaws into their retracting positions; wherebyr the retired positions of the said jawsl may be individually` regulated to accommodate various forms of work. o

6. In a work-holding chuck thecomb-ination with a jaw-carrying head; a pluralityVIV of work-gripping jaws mounted in the-saidV tion with a j avv-carrying head; a pluralityof o work-gripping jaws mounted inthe said head withcapacity VJfor radial movement with re- Y spect thereto; a `mounting-member for ythe said head; a driving-spindle projectingfrom said head and rotatably mounted inthe said mounting-member; a reciprocating jaw-expanding plunger extending axially'through the saidhead and driving-spindle; a-springseat anda jaw-expanding cammounted adjustably upon the respective opposite ends of the said plunger; ahelical spring encircling the said plunger and bearing against the ad justable spring-seat thereupon Vto exert aconstant eEort to move the same and the saidv jaw-expanding cam into their jaw-expanding positions; and springimeans normally'urg` 'Y ing the said working jaws into ,their inl j wardly-retracting positions. wherebythe retired positions of the said jaws v 8. In a work-holding chuck the combina-AV o tion lwith a j aw-carrying head Vformed infits inner end with an axial bore; a plurality of work-gripping jaws mounted inthe said head with capacity for radial movement with rel spect thereto a mounting-member for'the said head;

a driving-spindle rotatably mounted in thegsaid mounting-member andVV having itsouter end entered and secured inY Y i the 'bore in the said head andformed at its inner end withan integral pinion; a reciprocating jaw-expanding plunger extending axially lthrough the said head and driving` spindle; a helical spring encirclingthe said Y In vtestimony whereof, I have; signedthis i specification.

head with capacity for radial movement with respect thereto; a mounting-member for the said head; a longitudinallychambered driving-spindle projecting from-c said head and` rotatably mountedV in the said mounting-V member; a reciprocating j aw-expanding plunger extending axially through the' said head and driving-spindle; a helical spring encircling the said plunger within the chamber of the said driving-spindle and exerting a direct and constant elortto move the same into its jaw-expanding position; means for coupling the said plunger yto the said head for concurrent rotation therewith;

gripping jaws into their inwardly-retracting positions. f v o Y 7. In a work-holding. chuck the combinaand spring means normally urging the said workilo l CLIFFORD I; PAcxER. o i 

